The damping function, h([gamma]), has been a concept introduced in rheology since more than 30 years ago, and its implementation in the modeling of polymer melts was an essential step forward in the classification and understanding of nonlinear viscoelasticity
Hansen's team at Novo Nordisk is now using the "parallel rheological framework" methodology available in Abaqus to model polymers' nonlinear viscoelasticity
with greater accuracy than before.
The chapters sequentially discuss the structure of polymers, polymerization reactions and processes, linear viscoelasticity, tube models for linear polymers, determination of molecular weight distribution using rheology, tube models for branched polymers, nonlinear viscoelasticity
, tube models for nonlinear viscoelasticity
and of linear and branched polymers, and challenges for the future.
Leblanc, University P&M Curie, France; "Change in filler network and nonlinear viscoelasticity
of filled rubbers in large shearing deformations," Y.
His contributions to the mechanics and thermodynamics of solid polymers can be divided into three areas: 1) nonlinear viscoelasticity
of solid polymers; 2) physical aging in glassy polymers and the impact of mechanical deformations on the glassy state; and 3) mechanical and swelling responses of crosslinked rubber.
Considering that the strain-dependent R can well reflect the filler-structure evolution under strain sweep, the role of filler network in nonlinear viscoelasticity
of VGCF filled PS can be studied.
19) Mechanisms of nonlinear viscoelasticity
for filled elastomers and nano-filled polymer melts.
The time dependence becomes significant only for strains within the nonlinear viscoelasticity
Thus, not only linear viscoelasticity but also nonlinear viscoelasticity
must be considered.
After making correction for the strain-induced fractional free volume, we were able to successfully apply the time-strain superposition to compliance curves obtained for a series of stresses [11-15] in the region of nonlinear viscoelasticity
during creep procedure, and yield stress, yield strain, strain softening and rate effect in a constant crosshead speed test.
The creep behavior of the PLC is examined in the region of nonlinear viscoelasticity